Genes inherit; or they don't. If dominant, they should show in phenotype (appearance), and if they do not, it indicates that they are not present. Recessive genes and spontaneous mutations happen. No bird is genetically "perfect." Breeding a bird who looks perfect is as good as breeding one who "ought" to be perfect. No one should ever expect 100% "perfect" birds from any breeding. Perfect is a perception, not a reality.